RFID Attendance System with NodeMCU & Google Sheets

This system offers an automated attendance tracking solution by combining RFID technology with IoT capabilities—specifically, NodeMCU (ESP8266) for connectivity and Google Sheets for cloud-based record keeping. It enables real-time capture and tracking of attendance data.

You’ll learn how to: ✅ Connect an RFID-RC522 module to NodeMCU ✅ Display instructions on an LCD screen for smooth tag scanning ✅ Integrate your system with Google Sheets for instant updates ✅ Assign unique RFID cards or ID badges to each student or employee ✅ Keep attendance logs automatically stored in the cloud

Core Components

Hardware:
- NodeMCU (ESP8266): Powers the system and handles Wi-Fi connectivity.
- RFID Reader (e.g., MFRC522): Reads the unique ID from RFID cards or tags.
- Optional elements often include buzzers, LCDs, or LEDs for user feedback.
Software & Connectivity:
- Programming via the Arduino IDE using relevant libraries (e.g., MFRC522).
- Google Sheets API enables real-time data upload to a spreadsheet

System Workflow

Initialization: Hardware is set up and NodeMCU connects to Wi-Fi.
RFID Scan: User presents RFID tag/card; the reader captures the UID.
Data Transmission: NodeMCU sends this UID (and possibly other details) to Google Sheets.
Real-Time Update: Google Sheets receives and logs the attendance instantly.
Feedback Mechanism: A buzzer or display may confirm the scan.

Advantages

Speed & Efficiency: Automated scanning replaces manual records.
Accuracy: Eliminates errors due to handwriting or proxies.
Real-Time Tracking: Attendance is accessible immediately via cloud storage.
Analytics Ready: Google Sheets enables easy sorting, reporting, and sharing.

Optional Enhancements (from Related Research)

Firebase Cloud Integration & Dashboards: Instead of Google Sheets, using Firebase allows a real-time dashboard with visual analytics.
Additional Feedback: LEDs or LCD modules for better user interaction.
Security Features: Admin alerts, NTP servers for accurate timestamps, and validation of RFID tags can be incorporated.

Summary Table

Feature	Description
Hardware	NodeMCU (ESP8266), RFID reader, optional buzzer/display
Software	Arduino IDE, RFID library, Google Sheets API integration
Functionality	Scan → UID read → transmitted → recorded in real-time
Benefits	Automated, accurate, efficient, and instantly accessible data
Extensions	Firebase dashboards, visual feedback, timestamps, valida

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